chapter 16 somerset, pa will construct five ponds using shoreguard vinyl sheet piling. the first two...
TRANSCRIPT
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Chapter 16
Somerset, PA will construct five ponds using ShoreGuard vinyl sheet piling.The first two settling ponds the iron mixes with oxygen. The next two ponds contain limestone to remove the acid.Pond five will capture any remaining metals.Then it will flow through a wetland before entering Indian creek.
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Across the Ages
1.Stone Age 6,000 BC to 2,000 BC2.Bronze Age 2,500BC or 1,000AD3. Iron Age - most by 1,000BC
Bronze Age - Copper and TinBrass - Copper and zincSteel - iron and carbon
What age are we in now?
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Mining law 18721.Encouraged western settlement2.File claims to hard rock minerals at $2.50-
5.00 an acre & keep all profits3.Oil and gas leases on federal lands require
the payment of royalties4.Legacy of law - superfund sites/acid
drainage5.Colorado has about 23,000 abandoned
hard-rock mine sites - more than 500,000 nation wide
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Copperbasin (Ducktown) Tennessee
1960’s
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Copperbasin (Ducktown) Reclamation
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Smelting
Coke: what is coke?Hydrocarbon heated to remove volatiles to get pure carbon.
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Copper Basin ReclamationProblem: 1. Copper Discovered 18432. Heap Roasting of ore3. Acid Precipitation4. 50 square miles turned to waste5. Dams lost 25% storage capacity
Solution:1. 1930’s remediation failed - kudzu2. 16 Million Acid tolerant pine and grass seeds broadcast3. Added lime and fertilizer4. Cost $500.00 per acre5. Erosion went from 200 tons to 8 annually6. Target completion date 2000
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Summitville Colorado
Opened 1870
1985 Cyanide Heap Leaching - Canadian Company
1992 – Bankruptcy
Why are minerals located here?
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Mineral Formation
1. Magmatic concentration - as magma cools it separates with silicates rising and iron, nickel, & copper sinking - layered by density
2. Hydrothermal processes - dissolved minerals mix with salts to form a metal-bearing complex - gold, silver, copper, lead & zinc
3. Sedimentation - dissolved minerals are deposited manganese, copper, sulfur & phosphorus - warm meets cold
4. Evaporation - lakes without outlets salt, borax, potassium, gypsum
Metallic and Non-Metallic Minerals
Source / Transport / Trapping
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Salt Flats
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Environmental Impacts
1. Disturbs large areas of land
2. Uses huge quantities of water - pump out groundwater for processing
3. Affects water and air quality - acid drainage & sulfur
4. Requires extensive energy input
5. Long term hazard
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Hydraulic Mining
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Environmental Implications of Minerals
Environmental Impacts of Refining Minerals
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Cost Benefit Analysis1. Boom and bust job cycle
2. True cost has not been incorporated into cost-benefit analysis
•Cost: equipment, salaries, maintenance, mining operations, transport & fuel, insurance, safety, workers benefits, infrastructure and development of mine
•Benefits: jobs, purchases made by workers, local Vs larger economy
Costs not included: water & air pollution, workers health, remediation and clean-up (super fund), loss to fisheries…etc.
Long Term VS Short Term?
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Environmental Implications of Minerals
Case-in-Point: Copper Basin, TN
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The LawSurface Mining Control & Reclamation Act of 1997
•Only covers coal
•SMCRA created two programs: •one for regulating active coal mines•one for reclaiming abandoned mines
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Phytoremediation - Thlaspi1. Absorbs Zinc & Cadmium2. Has an ability to concentrate heavy metals in plant parts
Advantages Disadvantages
Works on a variety of organic and inorganics
May take several years to remediate
Easy to implement Restricted to shallow sites
Low Cost Dependent on Climate
Environmentally friendly
Possible impacts on food chain
Pleasing to the eye Harvest can be classified as hazardous waste
Reduces waste to landfill
Human consumption of food a concern
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International Sources - Stockpiling
The United States has discovered nearly $1 trillion in untapped mineral deposits in Afghanistan, including huge veins of iron, copper, cobalt, gold and lithium.
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Reserve Vs ResourceReserves:1. Have been located and quantified2. Can be extracted with current technology3. Can be extracted profitably
Resource:1. Does not yet qualify but located 2. Future technology may make accessible
• To Deep or under ocean3. Not profitable under current technology
• Low Grade• Contaminated• Drilled out as a reserve source
Total Resources = Reserve + Resource
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Will We Run Out?
1. New Discoveries2. Replacement Materials - plastics3. Changing global economy4. Technology Changes5. Conservation
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Future Trends
1. Deep Oceans - international waters2. Antarctica - should we - will we3. Biomining4. Design - dematerialization
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KaolinChattahoochee, Ocmulgee, Oconee and Savannah Rivers where inland shipping was stopped by falls or rapids at the Fall Line.
Uses: paper, food additive, toothpaste, cosmetics…
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Geology
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Geo
log
y
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Stone MT. in Bloom
Diamorphia Smallii
Confederate Daisy